Window Size Checker
Resize this browser window to compare its reported dimensions. Values stay in this page and the last 20 readings are kept in memory.
Outer dimensions include browser chrome; inner dimensions describe the viewport. Available screen space can exclude system UI. Small, Medium, Large, and XL are selected from transparent CSS width boundaries shown in the tool; they are labels for layout width, not device classifications.
Recent readings (last 20)
A QUICK WALKTHROUGH
How to use this tool
- Read outer, inner, and available dimensions.
- Resize the browser to update the live values.
- Compare the last 20 readings and the CSS width preset.
Reported dimensions
Outer dimensions include browser chrome; inner dimensions describe the viewport. Available screen space can exclude system UI.
CSS width presets
Small, Medium, Large, and XL are selected from transparent CSS width boundaries shown in the tool; they are labels for layout width, not device classifications.
GOOD TO KNOW
Common questions
Does resizing save anything?
No. Only the last 20 readings remain in memory while this page is open.
What do the presets mean?
They describe the current CSS inner width using the displayed boundaries; they do not identify hardware.